Have you heard of getting injections in the eyeball and what are they for?

I have an old friend, about 84, who was getting a shot in her eyeball once a month. On “Mad Money” a guest was saying their company has a solution for the needle so “the injections only need to be given every three months. The doctors don’t like to give them ; they’re uncomfortable. ” He said they are given behind the eyeball.
Does anyone know what the purpose is? My friend told me after getting three shots the doctor said , “they didn’t work. We’ll try something else.”